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5:00To The Best of Our KnowledgeTo the Best of Our Knowledge is an audio magazine of ideas -- two hours of smart, entertaining radio for people with curious minds addressing topics accross the spectrum of life today.

6:00Inside EuropeInside Europe provides listeners with the latest developments in Europe as a network of staff and freelance correspondents look beyond the headlines to provide analysis, background and color to make the European story relevant for American listeners.

FBI Agent Richard DesLauriers says the photos came from surveillance cameras, photos and other evidence near the explosion sites.

DesLauriers says one the suspects is believed to have planted the devices near the finish line of the race. He says both suspects are considered armed and extremely dangerous.

The explosions Monday killed three people and injured more than 180.

The images were released hours after President Barack Obama and first lady Michelle Obama attended an interfaith service at a Roman Catholic cathedral in Boston to remember the victims, including an 8-year-old boy.